BoilerFaultCodes 26 Medium
Boiler Fault Code 26
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 26 appears across 22 boiler brands and 73 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is experiencing a temporary communication error or internal glitch that usually resolves itself, but may require a simple reset if the heating doesn't resume. (As reported on Vokera Easi-Heat I)
Pick your boiler brand for the 26 fix
Alpha 26 3 models Baxi 26 7 models Biasi 26 4 models Chaffoteaux 26 3 models ECA 26 1 model Ferroli 26 4 models Gledhill 26 1 model Glow-worm 26 1 model Grant 26 1 model Heatline 26 3 models Ideal 26 7 models Johnson Starley 26 5 models Main 26 5 models Malvern 26 1 model Potterton 26 6 models Saunier Duval 26 1 model Sime 26 2 models Unical 26 2 models Viessmann 26 8 models Vokera 26 5 models Warmworld 26 1 model Worcester Bosch 26 2 models
Source
Information for the 26 fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026